Wood-preserving composition



Patented 17, 1928.

UNITED STATES" PATENT OFFICE.

KARL HEINRICH WOLMAN, OF BERLIN-GRUNEWALD, GERMANY.

WOOD-PRESERVE; COMPOSITION.

Io Drawing. Application filed August 9, 1924,

The object of the preservation of wood is, as is known, to protect the wood against destroying influences, especially as regards wood-destroying fungi with respect to the various wood-preserving means lsvery different, so that the composition of a woodpreserving means which shall be e'flfective under all circumstances must be such that the development of all wood-destroying organism, first of all of the fungi and o the noxious animals, is securely prevented.

The present invention relates to a woodpreserving means of such a composition; it is effective not only against one or another wood-enemy, but against all. The wood- I preserving composition comprises fluorinecompounds, as for instance water-soluble salts of hydrofluoric acid or of hydro-fluosilicic acid or combinations of both, furthermore nitrated phenols, or products of the nitration of the' homologue phenols, or of the salts or the derivates thereof, as for instance mononitro phenols, dinitro-phenols, dinitro-phenol-salts; or nitrated cr'esols or the salts or the derivates or mixtures thereof;

ffithermore soluble arsen-compounds, as for instance arsenic acid, arsenious acid, of salts of these acids, or combinations of several arsenic compounds.

To these components may be added such compounds which prevent the iron from being affected by the solution of the impreg natin means, as for instance sodium arsenate, rax, or alkali metal bichromatesfior Serial No. 731,223, and in Austria ltay 23, 1924.

which diminish the inflammabilit of the wood, as for instance, sulphate or orate of ammonium, sodium chloride, sul hate of sodlum, or the mixture thereof, an so .on.

First emample. I

1 3 parts of arsenious acid, 20 parts of sod1um-arsenate,20 parts of sodium-fluoride, 20 parts of sodium silico-fluoride and 10 parts of 2,4 dinitrophenol are dissolved in water, and this solution is then used for the impregnation of the woods.

Second ewa/mple.

80 parts of sodium-fluoride, 10 parts of sodium-arsenate, 5 parts of dinitro-cresol, 4 parts of ortho-nitrophenol, 18 parts of phosphate of ammonium, and 30 parts of sodlum-chloride are dissolved in 8000 parts of water. Also this solution is then used for the impregnation of wood.

The solutions may be employed in an desired manner, that means either in co d or in hot state, in open vats or in closed vessels, in a. vacuum or under pressure, or after Boucheries method. The com onents may be mixed first and then dissolve or each'may be dissolved separately and these solutions may then be mixed with each other, or first the first of the components may be dissolved in a quantity of water sufficient for all components, then the second component is introduced into this solution, thereafter the third is introduced into the solution now obtained, and so on, until all components have been dissolved successivelyz I claim A wood preserving composition, com rising arsenic acid, sodium arsenate, so ium fluoride, sodium silico-fluoride and dinitrophenol. In testimony whereofI alfix my signature.

. KARL HEINRICH WOLMAN. 

